Sofa



FIG. 1 is a front perspective view of the sofa of my new design;

FIG. 2 is a front elevational view of the sofa of my new design;

FIG. 3 is a left side elevational view of the sofa of my new design, the right side being a mirror image thereof; and,

FIG. 4 is a rear elevational view of the sofa of my new design.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sofa, as shown and described. 